The mailing list for listmasters using Sympa

[Amos <address@concealed>]

On Mon, Nov 10, 2014 at 10:55 AM, Amos <address@concealed> wrote:

This morning I noticed our 6.1.23 server in some sort of mail loop with postmaster@*, but it was by far worse with postmaster--stagnesorg.onmicrosoft.com.  What's causing this?  Can't say I've ever seen this sort of thing before with all the years we've been running Sympa.  Is this related to DMARC?

well, the spool/msg/bad directory has a whole ton of messages from address@concealed that look like the following.  So I guess Sympa started it by sending a report to postmaster at the remote site, and in this case, the response was a form message, and so a mail loop ensued.  Though, still not entirely sure what started all of this in the first place.....

Delivery has failed to these recipients or groups:

address@concealed<mailto:address@concealed=

oft.com>

The email address you specified couldn't be found or is invalid. It may be =

due to a bad entry in your Outlook or Outlook Web App recipient AutoComplet=

e cache. Use the steps below to clear the entry from the cache:

  1.  Click New mail.

  2.  In the To field start typing the recipient's name or email address un=

til the recipient appears in the drop-down list.

  3.  Use the DOWN ARROW and UP ARROW keys to select the recipient, and the=

n press the DELETE key.

Then resend your message =96 delete and retype the recipient=92s name or e-=

mail address before sending it.

For more tips to help resolve this issue see DSN 5.1.x Errors in Exchange O=

nline and Office 365<http://go.microsoft.com/fwlink/?LinkId=3D389363>.